[OpenLayers-Users] unneeded tiles for switched off layers

[GregM]

There is still a problem with layer tiles downloading depending on map scale
value in 2.5 RC. 

Tiles for invisible layers are downloaded from server after layer(s) goes
beyond its minScale. 
Value of minScale is making layer not downloaded while map initialization
but downloaded after zooming to scale < minScale, even if layer is not
switched on. 

This makes server much more busy and generate unneeded traffic, resulting in
map page much less respondent, especially with large overlays.

Greg 
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